US6323640B1 - Rolling bearing unit with a rotating speed measuring device - Google Patents

Rolling bearing unit with a rotating speed measuring device Download PDF

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US6323640B1
US6323640B1 US09/232,335 US23233599A US6323640B1 US 6323640 B1 US6323640 B1 US 6323640B1 US 23233599 A US23233599 A US 23233599A US 6323640 B1 US6323640 B1 US 6323640B1
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Prior art keywords
encoder wheel
bearing unit
race
insert
sealing device
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US09/232,335
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Daniele Forestiero
Angelo Vignotto
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SKF Industrie SpA
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SKF Industrie SpA
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Assigned to SKF INDUSTRIE S.P.A. reassignment SKF INDUSTRIE S.P.A. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FORESTIERO, DANIELE, VIGNOTTO, ANGELO
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C41/00—Other accessories, e.g. devices integrated in the bearing not relating to the bearing function as such
    • F16C41/007—Encoders, e.g. parts with a plurality of alternating magnetic poles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/72—Sealings
    • F16C33/76—Sealings of ball or roller bearings
    • F16C33/78—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members
    • F16C33/7869—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward
    • F16C33/7879—Sealings of ball or roller bearings with a diaphragm, disc, or ring, with or without resilient members mounted with a cylindrical portion to the inner surface of the outer race and having a radial portion extending inward with a further sealing ring
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
    • G01P3/42—Devices characterised by the use of electric or magnetic means
    • G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
    • G01P3/443—Devices characterised by the use of electric or magnetic means for measuring angular speed mounted in bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C19/00—Bearings with rolling contact, for exclusively rotary movement
    • F16C19/02—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows
    • F16C19/14—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load
    • F16C19/18—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls
    • F16C19/181—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact
    • F16C19/183—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles
    • F16C19/184—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles in O-arrangement
    • F16C19/185—Bearings with rolling contact, for exclusively rotary movement with bearing balls essentially of the same size in one or more circular rows for both radial and axial load with two or more rows of balls with angular contact with two rows at opposite angles in O-arrangement with two raceways provided integrally on a part other than a race ring, e.g. a shaft or housing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2326/00—Articles relating to transporting
    • F16C2326/01—Parts of vehicles in general
    • F16C2326/02—Wheel hubs or castors

Definitions

  • the present invention refers to a roller bearing unit, in particular for the hub of a vehicle wheel, of the kind equipped with a sealing device and a device for measuring the rotating speed of the outer race.
  • Known measuring devices of the aforementioned type comprise an encoder wheel in the form of an annular disc of magnetised plastic or rubber material, which is rotatably secured to the rotating ring of the bearing.
  • the encoder wheel is forcefully fitted onto the rotating ring of the bearing or onto an element fixedly connected to it.
  • encoder wheels of this type do not stand up very well to the stress to which they are subjected when they are forcefully fitted; furthermore, encoder wheels fitted in this way are exposed to the action of external contaminating agents such as water, dust, mud, metal particles from nearby brake devices etc; when said contaminating agents come into contact with said encoder wheels their performance tends to be impaired and the signal produced by a sensor which picks up variations in magnetic flow generated by the rotating encoder wheel can be adversely affected.
  • the encoder wheel is integrated into the sealing device of the bearing unit. While this kind of alternative presents certain advantages in some respects, the encoder wheel is however fitted in such a way as to present a restricted surface for the sensor to read.
  • An aim of the present invention is to achieve a robust, reliable arrangement which ensures that the encoder wheel does not risk being damaged during assembly, transport or use.
  • Another aim of the present invention is to achieve an arrangement of reduced overall dimensions, housing the encoder wheel between the axial dimensions of the bearing unit.
  • Another aim of the present invention is to obtain maximum intensity from the magnetic field generated by the encoder wheel, and to obtain a larger reading surface for the sensor in use facing the encoder wheel.
  • Another aim of the present invention is to propose a method which can also be applied to conventional bearing units, without having to modify them in order to mount an encoder wheel onto said conventional bearing units.
  • a further aim of the present invention is to achieve an arrangement which protects the magnetised wheel from sudden extreme changes in temperature caused by vehicle brake devices located near the hub.
  • a roller bearing unit in particular for the hub of a vehicle wheel, the bearing comprising a radially outer rotating race, a radially inner stationary race, a sealing device between said races and a device for measuring the rotating speed of the outer race
  • said measuring device comprises an encoder wheel in the form of a radially oriented annular disc of magnetised plastic or rubber material, characterised in that the bearing comprises a metallic annular insert adapted for fixing the encoder wheel to the bearing outer race, said insert forming: an outer cylindrical portion for forcefully fitting to an outer surface of the outer race; a radial wall portion concurring in forming an annular seat for accommodating the encoder wheel, said wall portion extending radially inwardly so as to co-operate with said sealing device to close the gap between said races; a portion joining said outer cylindrical portion and said radial wall portion, said joining portion being the part on which an axial thrust is exerted for performing said force
  • FIG. 1 is an axial sectional view of a bearing unit provided with an encoder wheel according to the present invention
  • FIG. 2 is a view, on an enlarged scale, of the detail of the encoder wheel shown in FIG. 1 in a relevant first preferred embodiment
  • FIGS. 3 and 4 are views similar to FIG. 2, showing relevant modified forms of the encoder wheel according to the present invention.
  • a bearing unit for the hub of a vehicle wheel comprises a radially outer rotating race 10 , a radially inner stationary race 11 , and two series of rolling elements 12 , in this example spheres, interposed between the races 10 and 11 .
  • the bearing unit is provided with a measuring device for measuring the rotating speed of the outer race 10 , the measuring device comprises an encoder wheel 13 , mounted on the rotating race, and a sensor (not illustrated) facing the encoder wheel and mounted on a fixed wall of the vehicle.
  • the encoder wheel 13 is a radially oriented annular disc made of plastic or magnetised rubber with alternating polarities around the circumference and mounted on the axially inner side of the outer race 10 .
  • the encoder wheel 13 is vulcanised on a substantially annular metallic insert 14 the shape of which in axial section is duly profiled so as to show an external cylindrical portion 14 a and an inner radial wall 14 b, joined by an elbow portion 14 c which extends axially towards the inner side of the vehicle.
  • the radial wall 14 b and the joining portion 14 c show an annular seat which houses the encoder wheel.
  • the elbow portion 14 c extends axially by a minimum distance of R with regard to the axially inner side 13 a of the encoder wheel 13 to protect said encoder wheel from any eventual shocks caused, for example, by grit which might strike the encoder wheel during use (according to the direction indicated by arrow A), and to provide an axially extending surface on which to exert an axial thrust to mount the encoder wheel on the bearing unit, according to the direction indicated by arrow B.
  • the annular seat in which the encoder wheel is housed has an axial dimension exceeding that of the encoder wheel.
  • the encoder wheel vulcanised on the insert 14 is mounted on the outer rotating race 10 fitting the cylindrical portion 14 a around the outer cylindrical surface 10 a of the outer rotating race 10 , and pushing axially against the elbow portion 14 c until the radial wall 14 b of the insert 14 abuts against the axially outer side 10 b of the outer race 10 and against a radial wall 15 a of a shield 15 which forms part of a sealing device indicated in its entirety with 16 , which hermetically seals the gap between the outer race 10 and the inner race 11 .
  • elbow portion takes up less space in the radial dimension in order to increase the surface of the encoder wheel and thus optimise the reading space for the sensor (not illustrated) facing the encoder wheel.
  • the annular insert 14 which supports the encoder wheel 13 is made in such a way as to provide total external protection for the encoder wheel.
  • the insert forms a seat 14 d with an axial section in the form of a C, congruent with the outline of the encoder wheel.
  • the encoder wheel is made in this form, in plastic or magnetised rubber material, it can still be vulcanised to the insert 14 and magnetised together with the insert, as in the previous examples, or it can be magnetised separately and thus simply fitted into the seat made up of the part 14 d of the metallic insert 14 and locked onto the outer race 10 on which the insert 14 is forcefully fitted.
  • insert 14 is made of non-magnetic metal, for example non-magnetic steel or aluminium.
  • the encoder wheel is locked rotationally on to its own support by means of axial irregularities, in the form of bumps or grooves, at the interface between the encoder wheel and the radial surface against which it abuts when the insert 14 is forcefully fitted onto the rotating ring 10 of the bearing unit.
  • axial irregularities in the form of bumps or grooves, at the interface between the encoder wheel and the radial surface against which it abuts when the insert 14 is forcefully fitted onto the rotating ring 10 of the bearing unit.
  • the above-mentioned irregularities are achieved in the form of axial grooves 17 a on the axially outer side, and more exactly on the radially inner part of this side, of the encoder wheel 13 , and bumps 17 b in a radially outwardly directed extension 18 a of the rubber which forms lip 18 of the sealing device 16 , of a well-known type.
  • the irregularities 17 a, 17 b formed in the two contacting bodies should preferably be of different geometric shapes, so that when force fitting is performed the two elements which come into contact with each other yield elastically at certain points.
  • bumps could be made around the circumference of the extension 18 a while spiral grooves could be made in the encoder wheel, or vice versa, so as to impede relative rotation between these two elements.
  • the rubber lip being devoid of metallic particles, is more yieldable that the magnetised rubber from which the encoder wheel is made, so that in this case the extension 18 a is the more elastically yieldable element.
  • FIG. 4 also, however, presents certain advantages due to the fact that the extension of the lip 18 , apart from impeding the rotation of the encoder wheel in the insert 14 , creates a seal with regard to the infiltration of water and other contaminating agents as it prevents them from reaching the encoder wheel 13 by passing between the insert 14 and the shield 15 .
  • the connection between the encoder wheel 13 and the support insert 14 should be such that it does not produce any yield in the encoder wheel when the insert 14 is forcefully fitted onto the bearing unit.
  • the axial dimension of the annular seat in which the encoder wheel is housed should be greater than that of the encoder wheel itself in such a way as to leave, when the encoder wheel is assembled, an axial light L between the wheel and the surface 10 b of the race which it faces.
  • thrust B resulting from force fitting should not be exerted on the magnet; with regard to the arrangement illustrated in FIG. 4, the thrust should be exerted on the radial surface of the joining portion or zone 14 c.
  • the axial light L should preferably be equal to or less than 9.5 mm.
  • the insert 14 is extended radially inwardly towards the free end 20 a of a non-rotating annular shield 20 , also known as a centrifuge or by the English term of “flinger”, forming part of the sealing device 16 and constituting the friction surface against which the sealing lip 18 reacts.
  • a non-rotating annular shield 20 also known as a centrifuge or by the English term of “flinger”
  • the free end 20 a should preferably form a terminal edge bending radially outwardly to maximise the sealing action of the labyrinth seal and to improve the centrifugal effect.
  • the thrust exerted in force fitting does not cause any considerable overall strain in the encoder wheel, in that any stress arising from this operation is entirely absorbed by the support insert 14 .
  • the present invention permits the assembly of an encoder wheel which is contained within the axial dimensions of the bearing unit, defined by the axially inner side (on the right of the diagram) of the inner race 11 .
  • the insert of the present invention permits the reduction of the effect of sudden, extreme changes in temperature which encoder wheels located near vehicle brake devices are subject to.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Rolling Contact Bearings (AREA)

Abstract

A rolling bearing unit for the hub of a vehicle wheel has an outer rotating race (10), a radially inner stationary race (11), a sealing device (16) between the races (10, 11), and a device for measuring the rotating speed of the outer race (10). The measuring device has an encoder wheel (13) in the form of a radially oriented annular disc of magnetised plastic or rubber material. The rolling bearing has a metallic annular insert (14) adapted for fixing the encoder wheel (13) to the outer race (10); the insert (14) forms: an outer cylindrical portion (14 a) for forcefully fitting to an outer surface (10 a) of the outer race (10); a radial wall portion (14 b, 14 d) that concurs in forming an annular seat for accommodating the encoder wheel, and that extends radially inwardly so as to co-operate with the sealing device (16) to close the gap between the races (10, 11); and a joining portion (14 c) between the outer cylindrical portion (14 a) and the radial wall portion (14 b, 14 d), on which an axial thrust is applied for performing the force fitting.

Description

The present invention refers to a roller bearing unit, in particular for the hub of a vehicle wheel, of the kind equipped with a sealing device and a device for measuring the rotating speed of the outer race.
Known measuring devices of the aforementioned type comprise an encoder wheel in the form of an annular disc of magnetised plastic or rubber material, which is rotatably secured to the rotating ring of the bearing. In some well-known types of device, the encoder wheel is forcefully fitted onto the rotating ring of the bearing or onto an element fixedly connected to it. It has however been found that encoder wheels of this type do not stand up very well to the stress to which they are subjected when they are forcefully fitted; furthermore, encoder wheels fitted in this way are exposed to the action of external contaminating agents such as water, dust, mud, metal particles from nearby brake devices etc; when said contaminating agents come into contact with said encoder wheels their performance tends to be impaired and the signal produced by a sensor which picks up variations in magnetic flow generated by the rotating encoder wheel can be adversely affected.
In other well-known types of device, such as that described in Italian patent application No. TO97A000371 (not yet available to the public as of the date of the present application) the encoder wheel is integrated into the sealing device of the bearing unit. While this kind of alternative presents certain advantages in some respects, the encoder wheel is however fitted in such a way as to present a restricted surface for the sensor to read.
An aim of the present invention is to achieve a robust, reliable arrangement which ensures that the encoder wheel does not risk being damaged during assembly, transport or use.
Another aim of the present invention is to achieve an arrangement of reduced overall dimensions, housing the encoder wheel between the axial dimensions of the bearing unit.
Another aim of the present invention is to obtain maximum intensity from the magnetic field generated by the encoder wheel, and to obtain a larger reading surface for the sensor in use facing the encoder wheel.
Another aim of the present invention is to propose a method which can also be applied to conventional bearing units, without having to modify them in order to mount an encoder wheel onto said conventional bearing units.
A further aim of the present invention is to achieve an arrangement which protects the magnetised wheel from sudden extreme changes in temperature caused by vehicle brake devices located near the hub.
These and other objectives and advantages, which will be better understood hereinafter, are achieved according to the present invention by a roller bearing unit, in particular for the hub of a vehicle wheel, the bearing comprising a radially outer rotating race, a radially inner stationary race, a sealing device between said races and a device for measuring the rotating speed of the outer race, wherein said measuring device comprises an encoder wheel in the form of a radially oriented annular disc of magnetised plastic or rubber material, characterised in that the bearing comprises a metallic annular insert adapted for fixing the encoder wheel to the bearing outer race, said insert forming: an outer cylindrical portion for forcefully fitting to an outer surface of the outer race; a radial wall portion concurring in forming an annular seat for accommodating the encoder wheel, said wall portion extending radially inwardly so as to co-operate with said sealing device to close the gap between said races; a portion joining said outer cylindrical portion and said radial wall portion, said joining portion being the part on which an axial thrust is exerted for performing said force fitting.
There will now be described the structural and functional characteristics of some preferred but not limiting embodiments of the bearing unit according to the invention, reference being made to the accompanying drawings, in which:
FIG. 1 is an axial sectional view of a bearing unit provided with an encoder wheel according to the present invention;
FIG. 2 is a view, on an enlarged scale, of the detail of the encoder wheel shown in FIG. 1 in a relevant first preferred embodiment and
FIGS. 3 and 4 are views similar to FIG. 2, showing relevant modified forms of the encoder wheel according to the present invention.
With reference to FIGS. 1 and 2, a bearing unit for the hub of a vehicle wheel comprises a radially outer rotating race 10, a radially inner stationary race 11, and two series of rolling elements 12, in this example spheres, interposed between the races 10 and 11. The bearing unit is provided with a measuring device for measuring the rotating speed of the outer race 10, the measuring device comprises an encoder wheel 13, mounted on the rotating race, and a sensor (not illustrated) facing the encoder wheel and mounted on a fixed wall of the vehicle.
The encoder wheel 13 is a radially oriented annular disc made of plastic or magnetised rubber with alternating polarities around the circumference and mounted on the axially inner side of the outer race 10.
With particular reference to FIG. 2, the encoder wheel 13 is vulcanised on a substantially annular metallic insert 14 the shape of which in axial section is duly profiled so as to show an external cylindrical portion 14 a and an inner radial wall 14 b, joined by an elbow portion 14 c which extends axially towards the inner side of the vehicle. The radial wall 14 b and the joining portion 14 c show an annular seat which houses the encoder wheel.
The elbow portion 14 c extends axially by a minimum distance of R with regard to the axially inner side 13 a of the encoder wheel 13 to protect said encoder wheel from any eventual shocks caused, for example, by grit which might strike the encoder wheel during use (according to the direction indicated by arrow A), and to provide an axially extending surface on which to exert an axial thrust to mount the encoder wheel on the bearing unit, according to the direction indicated by arrow B. In other words, the annular seat in which the encoder wheel is housed has an axial dimension exceeding that of the encoder wheel.
The encoder wheel vulcanised on the insert 14 is mounted on the outer rotating race 10 fitting the cylindrical portion 14 a around the outer cylindrical surface 10 a of the outer rotating race 10, and pushing axially against the elbow portion 14 c until the radial wall 14 b of the insert 14 abuts against the axially outer side 10 b of the outer race 10 and against a radial wall 15 a of a shield 15 which forms part of a sealing device indicated in its entirety with 16, which hermetically seals the gap between the outer race 10 and the inner race 11.
With reference to FIG. 3 a variation is illustrated which differs from FIG. 2 in that the elbow portion takes up less space in the radial dimension in order to increase the surface of the encoder wheel and thus optimise the reading space for the sensor (not illustrated) facing the encoder wheel.
With reference to FIG. 4, the annular insert 14 which supports the encoder wheel 13 is made in such a way as to provide total external protection for the encoder wheel. With this aim, the insert forms a seat 14 d with an axial section in the form of a C, congruent with the outline of the encoder wheel. When the encoder wheel is made in this form, in plastic or magnetised rubber material, it can still be vulcanised to the insert 14 and magnetised together with the insert, as in the previous examples, or it can be magnetised separately and thus simply fitted into the seat made up of the part 14 d of the metallic insert 14 and locked onto the outer race 10 on which the insert 14 is forcefully fitted.
The above-mentioned variation, which provides for separate magnetisation, has an advantage in that it permits improved magnetisation which is also simpler from a practical point of view in comparison with that obtained by magnetising an encoder wheel already vulcanised in an insert. It is preferable that insert 14 is made of non-magnetic metal, for example non-magnetic steel or aluminium.
In the case that the encoder wheel is not vulcanised to insert 14, the encoder wheel is locked rotationally on to its own support by means of axial irregularities, in the form of bumps or grooves, at the interface between the encoder wheel and the radial surface against which it abuts when the insert 14 is forcefully fitted onto the rotating ring 10 of the bearing unit. In the example illustrated in FIG. 4, the above-mentioned irregularities are achieved in the form of axial grooves 17 a on the axially outer side, and more exactly on the radially inner part of this side, of the encoder wheel 13, and bumps 17 b in a radially outwardly directed extension 18 a of the rubber which forms lip 18 of the sealing device 16, of a well-known type. The irregularities 17 a, 17 b formed in the two contacting bodies should preferably be of different geometric shapes, so that when force fitting is performed the two elements which come into contact with each other yield elastically at certain points. For example, bumps could be made around the circumference of the extension 18 a while spiral grooves could be made in the encoder wheel, or vice versa, so as to impede relative rotation between these two elements. The rubber lip, being devoid of metallic particles, is more yieldable that the magnetised rubber from which the encoder wheel is made, so that in this case the extension 18 a is the more elastically yieldable element.
It will be obvious to experts in the relevant sector that numerous modifications can be made with a view to using elastic yieldability to block the encoder wheel with regard to the rotating ring of the bearing unit. For example, axial protuberances could be made in the encoder wheel and/or on the radial wall 15 a of the metallic shield 15 in the case that the lip 18 does not have the extension 18 a illustrated in FIG. 4; in such a case the magnetised rubber of the encoder wheel will obviously yield against the metallic shield 15.
The arrangement illustrated in FIG. 4 also, however, presents certain advantages due to the fact that the extension of the lip 18, apart from impeding the rotation of the encoder wheel in the insert 14, creates a seal with regard to the infiltration of water and other contaminating agents as it prevents them from reaching the encoder wheel 13 by passing between the insert 14 and the shield 15.
Again with reference to FIG. 4, the connection between the encoder wheel 13 and the support insert 14 should be such that it does not produce any yield in the encoder wheel when the insert 14 is forcefully fitted onto the bearing unit. With this aim in view, it is also preferable that, in this kind of arrangement, the axial dimension of the annular seat in which the encoder wheel is housed should be greater than that of the encoder wheel itself in such a way as to leave, when the encoder wheel is assembled, an axial light L between the wheel and the surface 10 b of the race which it faces. As described above, thrust B resulting from force fitting should not be exerted on the magnet; with regard to the arrangement illustrated in FIG. 4, the thrust should be exerted on the radial surface of the joining portion or zone 14 c. The axial light L should preferably be equal to or less than 9.5 mm.
Other than permitting the achievement of the aims outlined in the introduction of the present description, all the arrangements described herein permit the elimination of conventional external sealing material which is usually fitted between the outer cylindrical surface of the outer race and the encoder wheel. In the example shown in FIG. 4, as stated, sealing is ensured by exploiting the extension 18 a of the rubber lip of the sealing device 16; in the examples shown in FIGS. 2 and 3, sealing is guaranteed by the contact between the inner diameter zone 14 e of the insert 14 and the outer radial part 18 b of the lip 18.
Again with reference to FIGS. 2, 3 and 4, the insert 14 is extended radially inwardly towards the free end 20 a of a non-rotating annular shield 20, also known as a centrifuge or by the English term of “flinger”, forming part of the sealing device 16 and constituting the friction surface against which the sealing lip 18 reacts. When this is extended towards the centrifuge shield 20 it defines, together with the insert 14, a labyrinth seal which works to perfect the contact sealing described above. The free end 20 a should preferably form a terminal edge bending radially outwardly to maximise the sealing action of the labyrinth seal and to improve the centrifugal effect.
As can be appreciated, in all the variations described above the thrust exerted in force fitting does not cause any considerable overall strain in the encoder wheel, in that any stress arising from this operation is entirely absorbed by the support insert 14. It can also be noted that the present invention permits the assembly of an encoder wheel which is contained within the axial dimensions of the bearing unit, defined by the axially inner side (on the right of the diagram) of the inner race 11. Finally, the insert of the present invention permits the reduction of the effect of sudden, extreme changes in temperature which encoder wheels located near vehicle brake devices are subject to.

Claims (12)

What is claimed is:
1. A rolling bearing unit for a hub of a vehicle wheel, the bearing comprising:
a radially outer rotating race;
a radially inner stationary race;
a sealing device positioned between said races; and
a measuring device for measuring the rotating speed of the outer race, said measuring device comprising an encoder wheel comprising a radially oriented annular disc of magnetized plastic or rubber material;
the bearing further comprising a metallic annular insert adapted for fixing the encoder wheel to the bearing outer race, said insert comprising:
an outer cylindrical portion that attaches via a force fit to an outer surface of the outer race;
a radial wall portion that forms an annular seat for accommodating the encoder wheel, said wall portion extending radially inwardly so as to co-operate with said sealing device to close the gap between said races; and
a portion joining said outer cylindrical portion and said radial wall portion, said joining portion being a surface on which an axial thrust is applied for performing said force fitting;
wherein the surface on which said axial thrust is applied has an elbow portion joining said outer cylindrical portion to said radial wall portion.
2. The bearing unit of claim 1, wherein said encoder wheel is vulcanized in said seat of the insert.
3. The bearing unit of claim 1, wherein said annular seat has an axial dimension exceeding an axial dimension of the encoder wheel.
4. The bearing unit of claim 1, wherein at least a part of the radial wall portion abuts against a radially outwardly directed extension of a rubber lip of the sealing device.
5. The bearing unit of claim 1, wherein said radial wall portion covers an axially outer side of the encoder wheel.
6. The bearing unit of claim 5, wherein the encoder wheel is separately magnetized before being connected to the insert and elastically yieldable means are axially provided at an interface between the encoder wheel (13) and a surface against which the encoder wheel abuts, to rotationally lock the encoder wheel in relation to the outer race of the bearing unit.
7. The bearing unit of claim 6, wherein said elastically yieldable means are defined by at least one of bumps and grooves obtained in at least one of the encoder wheel, a radial wall of a metallic shield of the sealing device, or a radially outwardly directed extension of a rubber lip of the sealing device.
8. The bearing unit of claim 5, wherein at least a portion of an axially inner side of the encoder wheel abuts against a radially outwardly directed extension of a rubber lip of the sealing device.
9. The bearing unit of claim 5, wherein the insert comprises non-magnetic metal.
10. The bearing unit of claim 1, wherein said radial wall of the insert continues in a radially inner direction towards a non-rotating annular shield of the sealing unit to define, together with the sealing device, a labyrinth seal.
11. A rolling bearing unit for a hub of a vehicle wheel, the bearing comprising:
a radially outer rotating race;
a radially inner stationary race;
a sealing device positioned between said races; and
a measuring device for measuring the rotating speed of the outer race, said measuring device comprising an encoder wheel comprising a radially oriented annular disc of magnetized plastic or rubber material;
the bearing further comprising a metallic annular insert adapted for fixing the encoder wheel to the bearing outer race, said insert comprising:
an outer cylindrical portion that attaches via a force fit to an outer surface of the outer race;
a radial wall portion that forms an annular seat for accommodating the encoder wheel, said wall portion extending radially inwardly so as to co-operate with said sealing device to close the gap between said races; and
a portion joining said outer cylindrical portion and said radial wall portion, said joining portion being a surface on which an axial thrust is applied for performing said force fitting;
wherein the encoder wheel is separately magnetized before being connected to the insert and wherein elastically yieldable means are axially provided at an interface between the encoder wheel and a surface against which the encoder wheel abuts, to rotationally lock the encoder wheel in relation to the outer race of the bearing unit.
12. A rolling bearing unit for a hub of a vehicle wheel, the bearing comprising:
a radially outer rotating race;
a radially inner stationary race;
a sealing device positioned between said races; and
a measuring device for measuring the rotating speed of the outer race, said measuring device comprising an encoder wheel comprising a radially oriented annular disc of magnetized plastic or rubber material;
the bearing further comprising a metallic annular insert adapted for fixing the encoder wheel to the bearing outer race, said insert comprising:
an outer cylindrical portion that attaches via a force fit to an outer surface of the outer race;
a radial wall portion that forms an annular seat for accommodating the encoder wheel, said wall portion extending radially inwardly so as to co-operate with said sealing device to close the gap between said races; and
a portion joining said outer cylindrical portion and said radial wall portion, said joining portion being a surface on which an axial thrust is applied for performing said force fitting;
wherein the encoder wheel is separately magnetized before being connected to the insert and wherein elastically yieldable means are axially provided at an interface between the encoder wheel and a surface against which the encoder wheel abuts, to rotationally lock the encoder wheel in relation to the outer race of the bearing unit;
wherein said elastically yieldable means are defined by at least one of bumps or grooves obtained in at least one of the encoder wheel, a radial wall of a metallic shield of the sealing device, or a radially outwardly directed extension of a rubber lip of the sealing device.
US09/232,335 1998-01-16 1999-01-15 Rolling bearing unit with a rotating speed measuring device Expired - Lifetime US6323640B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITTO98A0035 1998-01-16
IT98TO000035A ITTO980035A1 (en) 1998-01-16 1998-01-16 ROLLING BEARING WITH ROTATION SPEED DETECTION DEVICE.

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EP (1) EP0930505B1 (en)
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US20060227007A1 (en) * 2003-03-27 2006-10-12 Franck Landrieve Sensor unit, and housing-relay for the production of said unit
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US20220187166A1 (en) * 2019-04-12 2022-06-16 Safran Electrical & Power Device for monitoring the degradation of rolling bearings
US20240116490A1 (en) * 2022-10-09 2024-04-11 Reginald V. Maclin Travel Distance Extender for Electric Vehicles

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US20020131659A1 (en) * 2001-03-16 2002-09-19 Skf Industrie S.P.A. Sealing device for rolling bearings
US7811005B2 (en) 2001-09-12 2010-10-12 Aktiebolaget Skf Thrust bearing device for a vehicle suspension
US7699732B2 (en) 2001-11-13 2010-04-20 Aktiebolaget Skf Instrumented take-up unit and related control method
US7290351B2 (en) 2002-01-29 2007-11-06 Aktiebolaget Skf Mounting bracket, rolling bearing and corresponding assembly method
US7275462B2 (en) 2002-06-20 2007-10-02 Aktiebolaget Skf Tensioning device for prestressing a rod, and related tensioning method
US20050165397A1 (en) * 2002-06-20 2005-07-28 Jose Faus Tensioning device for prestressing a rod, and related tensioning method
US7429133B2 (en) 2002-07-02 2008-09-30 Aktiebolaget Skf Instrumented antifriction bearing and electrical motor equipped therewith
US20060104558A1 (en) * 2002-07-02 2006-05-18 Samuel Gallion Instrumented antifriction bearing and electrical motor equipped therewith
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US20060227007A1 (en) * 2003-03-27 2006-10-12 Franck Landrieve Sensor unit, and housing-relay for the production of said unit
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US8123013B2 (en) 2003-07-28 2012-02-28 Skf France Freewheel bearing device with torque limiter
US20100219038A1 (en) * 2003-07-28 2010-09-02 Skf France Freewheel bearing device with torque limiter
US20070074945A1 (en) * 2003-07-28 2007-04-05 Frederic Ponson Freewheel bearing device with torque limiter
US7878714B2 (en) 2003-10-14 2011-02-01 Aktiebolaget Skf Clutch release bearing device
US20050135717A1 (en) * 2003-12-22 2005-06-23 Aktiebolaget Skf Sealing device for a wheel hub unit
US7153029B2 (en) * 2003-12-22 2006-12-26 Aktiebolaget Skf Sealing device for a wheel hub unit
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US20060011445A1 (en) * 2004-07-02 2006-01-19 Sylvain Bussit Clutch release bearing and method of manufacture
US7467702B2 (en) 2004-07-02 2008-12-23 Aktiebolaget Skf Clutch release bearing and method of manufacture
US20090180721A1 (en) * 2005-02-15 2009-07-16 Stellario Barbera Encoding Bearing Device and Rotating Machine
US20060243150A1 (en) * 2005-02-28 2006-11-02 Franck Landrieve Instrumented belt tensioner roller device and associated monitoring method
US8226301B2 (en) 2006-06-26 2012-07-24 Aktiebolaget Skf Suspension thrust bearing device and strut
US20080031562A1 (en) * 2006-06-26 2008-02-07 Thierry Poulle Suspension thrust bearing device and strut
US20080074104A1 (en) * 2006-09-22 2008-03-27 Dichtungstechnik G. Bruss Gmbh & Co. Kg Displaceable component including a position-defining element made of a magnetized elastomer
US7758459B2 (en) 2006-10-03 2010-07-20 Aktiebolaget Skf Tensioning roller device
US20080152272A1 (en) * 2006-12-15 2008-06-26 Franck Debrailly Instrumented rolling bearing device
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US8152381B2 (en) * 2007-01-13 2012-04-10 Schaeffler Kg Rolling bearing comprising a device for withdrawing a liquid
US20100111457A1 (en) * 2007-01-13 2010-05-06 Schaeffler Kg Rolling bearing comprising a device for withdrawing a liquid
US20080230341A1 (en) * 2007-02-27 2008-09-25 Pierre-Julien Barraud Disengageable pulley device
US8172056B2 (en) 2007-02-27 2012-05-08 Aktiebolaget Skf Disengageable pulley device
US20080289838A1 (en) * 2007-04-19 2008-11-27 Francois Niarfeix Instrumented joint system
US20080303513A1 (en) * 2007-06-08 2008-12-11 Kelsey-Hayes Company Wireless active wheel speed sensor
US8237431B2 (en) 2007-07-05 2012-08-07 Terry Fruehling Wheel speed sensor
US20090051349A1 (en) * 2007-07-05 2009-02-26 Terry Fruehling Wheel speed sensor
US8591115B2 (en) 2008-12-04 2013-11-26 Jtekt Corporation Rolling bearing device
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US9261144B2 (en) * 2013-09-04 2016-02-16 Aktiebolaget Skf Sealing and signaling device, in particular for a rolling bearing
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US10459000B2 (en) * 2016-11-28 2019-10-29 Aktiebolaget Skf Encoder wheel for wheel-hub unit
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US20220187166A1 (en) * 2019-04-12 2022-06-16 Safran Electrical & Power Device for monitoring the degradation of rolling bearings
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US20240116490A1 (en) * 2022-10-09 2024-04-11 Reginald V. Maclin Travel Distance Extender for Electric Vehicles

Also Published As

Publication number Publication date
ITTO980035A1 (en) 1999-07-16
EP0930505A1 (en) 1999-07-21
EP0930505B1 (en) 2003-11-19
DE69912862T2 (en) 2004-09-02
DE69912862D1 (en) 2003-12-24

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